When I use Media View ,my session deleted

Submitted by Derick Ng on 1 January 2010 - 4:54am

i use my custom auth system in my project and it save user informatin into session(no used Auth Component)
{{{
$this->Session->write( 'Cms.User', array (...) );
}}}

when is use This Code

{{{
function profile_donwload( $paperID )
{
if ( $file = $this->Paper->Attachment->read( null, $paperID ) )
{
$this->view = 'Media';
$params = array(
'id' =>